Serial/Series Title
343 Matching Results
Results open in a new window/tab.
Results:
1 - 24 of
343
next
Methods of Analyzing Wind-Tunnel Data for Dynamic Flight Conditions
"The effects of power on the stability and the control characteristics of an airplane are discussed and methods of analysis are given for evaluating certain dynamic characteristics of the airplane that are not directly discernible from wind-tunnel tests alone. Data are presented to show how the characteristics of a model tested in a wind tunnel are affected by power. The response of an airplane to a rolling and a yawing disturbance is discussed, particularly in regard to changes in wing dihedral and fin area" (p. 1).
Date:
October 1941
Creator:
Donlan, C. J. & Recant, I. G.
System:
The UNT Digital Library
Aerodynamic heating and the deflection of drops by an obstacle in an air stream in relation to aircraft icing
From Summary: "Two topics of interest to persons attempting to apply the heat method of preventing ice formation on aircraft are considered. Surfaces moving through air at high speed are shown, both theoretically and experimentally, to be subject to important aerodynamic heating effects that will materially reduce the heat required to prevent ice. Numerical calculations of the path of water drops in an air stream around a circular cylinder are given. From these calculations, information is obtained on the percentage of the swept area cleared of drops."
Date:
October 1940
Creator:
Kantrowitz, Arthur
System:
The UNT Digital Library
Effect of Pressure on the Spontaneous Ignition Temperature of Liquid Fuels
Report presenting an investigation of spontaneous ignition temperatures from 1 to 9 atmospheres in the air for n-heptane, isooctane, benzene, JP-4, and JP-5 fuels. Time lags before ignition were measured at each pressure for all fuels. Results regarding the effect of pressure, general comparisons of all fuels, and ignition-lag experiments are provided.
Date:
October 1956
Creator:
O'Neal, Cleveland, Jr.
System:
The UNT Digital Library
Experimental Investigation of the Strength of Multiweb Beams With Corrugated Webs
"The results of an experimental investigation of the strength of multiweb beams with corrugated webs are reported. Included in the investigation were two types of connection between the web and the skin. A comparison between the structural efficiency of corrugated-web and channel-web multiweb beams is presented, and it is shown that, for a considerable range of the structural index, corrugated-web beams can be built which are structurally more efficient than channel-web beams" (p. 1).
Date:
October 1956
Creator:
Fraser, Allister F.
System:
The UNT Digital Library
Tabulation of Mass-Flow Parameters for Use in Design of Turbomachine Blade Rows for Ratios of Specific Heats of 1.3 and 1.4
Report presenting mass-flow tables for ratios of specific heats for the entire range of critical velocity ratio. The tables enable a quick and accurate determination of the integrated average specific mass flow across a region where the end-point velocities are known. A numerical example using the tables is also provided.
Date:
October 1956
Creator:
Whitney, Warren J.
System:
The UNT Digital Library
Investigation of a related series of turbine-blade profiles in cascade
Report presenting an application of airfoil design methods to a series of related turbine-blade profiles to satisfy the conditions of inlet flow angle and turning angle encountered in the usual range of turbine operation. Satisfactory flow conditions were obtained in all of the blade passages tested. Results regarding the turning angles, wake losses, surface pressure distributions, critical Mach numbers, application of compressibility corrections to low-speed tests, and selection of design camber are provided.
Date:
October 1956
Creator:
Dunavant, James C. & Erwin, John R.
System:
The UNT Digital Library
Band-Pass Shock and Vibration Absorbers for Application to Aircraft Landing Gear
Note presenting a description of a new class of frequency-selective shock absorbers called band-pass shock absorbers, which were conceived as a means of overcoming some of the limitations of conventional shock absorbers. The shock absorbers may be designed to isolate two bodies from each other over certain ranges of exciting frequencies or rates of load application while coupling them over the remainder of the frequency spectrum.
Date:
October 1956
Creator:
Schnitzer, Emanuel
System:
The UNT Digital Library
Interaction of Bearing and Tensile Loads on Creep Properties of Joints
The interaction of bearing and tensile loads on the creep behavior of joints was studied. A specimen was designed for this study which possessed some of the general features of pin and rivet joint connections and an apparatus was constructed to apply both bearing and tensile loads to the joint model. Deformation measurements were made by use of a photogrid printed on the joint model.
Date:
October 1956
Creator:
Bodine, E. G.; Carlson, R. L. & Manning, G. K.
System:
The UNT Digital Library
A low-speed experimental investigation of the effect of a sandpaper type of roughness on boundary-layer transition
Report presenting an investigation in the low-turbulence pressure tunnel to determine the effect of size and location of a sandpaper type of roughness on the Reynolds number for transition. Transition was observed by means of a hot-wire anemometer at various chordwise stations for each position of roughness.
Date:
October 1956
Creator:
von Doenhoff, Albert E. & Horton, Elmer A.
System:
The UNT Digital Library
A Simple Method for Calculating the Characteristics of the Dutch Roll Motion of an Airplane
A simple method for calculating the characteristics of the Dutch roll motion of an airplane is obtained by arranging the lateral equations of motion in such form and order that an iterative process is quickly convergent. Primary effects of variation of the important stability derivatives on the period and damping can be seen more clearly from the iterative method than from the fourth-order characteristic equation.
Date:
October 1956
Creator:
Klawans, Bernard B.
System:
The UNT Digital Library
Tables for the Numerical Determination of the Fourier Transform of a Function of Time and the Inverse Fourier Transform of a Function of Frequency, With Some Applications to Operational Calculus Methods
Report presenting a set of tables which aids in the numerical determination of the Fourier transform of a function of time and the inverse Fourier transform of a function of frequency. Many of the operations normally performed theoretically with the operational calculus can be performed numerically with the aid of the tables. Some applications using the tables are described.
Date:
October 1957
Creator:
Huss, Carl R. & Donegan, James J.
System:
The UNT Digital Library
Generalized master curves for creep and rupture
Report presenting the similarity of Larson-Miller master curves for rupture life and minimum creep rate for aluminum, two aluminum alloys, two steels, and two high-temperature high-strength alloys. The approximate invariance of the product of rupture life and minimum creep rate is also shown for these materials.
Date:
October 1957
Creator:
Heimerl, George J. & McEvily, Arthur J., Jr.
System:
The UNT Digital Library
The Measurement of Pressure Altitude on Aircraft
Note presenting a determination of the accuracy with which pressure altitude can be measured by calculation of the errors in the measuring system, errors arising from operation of the system, and variations in atmospheric pressure. Some possibilities for reducing errors in the categories of altimeter-scale error, static-pressure error, atmospheric-reference error, flight technical error, friction error, and service error are provided.
Date:
October 1957
Creator:
Gracey, William
System:
The UNT Digital Library
Investigation of Some Mechanical Properties of Thermenol Compressor Blades
Note presenting a series of tests comparing the mechanical properties of similar compressor blades of AISI type 403 stainless steel and thermenol. Eighth-stage J47 and J65 compressor blades of each material were tested.
Date:
October 1957
Creator:
Johnson, Donald F.
System:
The UNT Digital Library
Motion of a ballistic missile angularly misaligned with the flight path upon entering the atmosphere and its effect upon aerodynamic heating, aerodynamic loads, and miss distance
From Summary: "An analysis is given of the oscillating motion of a ballistic missile which upon entering the atmosphere is angularly misaligned with respect to the flight path. The history of the motion for some example missiles is discussed from the point of view of the effect of the motion on the aerodynamic heating and loading. The miss distance at the target due to misalignment and to small accidental trim angles is treated. The stability problem is also discussed for the case where the missile is tumbling prior to atmospheric entry."
Date:
October 1957
Creator:
Allen, H. Julian
System:
The UNT Digital Library
Propellant vaporization as a criterion for rocket-engine design; Calculations using various log-probability distributions of heptane drops
Report presenting calculations made to determine the vaporization rates of fuel drops in a rocket engine for sprays having various log-probability distributions of n-heptane drops. The rates were calculated for various engine design and operating parameters. Results regarding the geometric standard deviation, mass-median drop size, variation in group size, and a correlation of results are provided.
Date:
October 1957
Creator:
Priem, Richard J.
System:
The UNT Digital Library
Heat transfer and boundary-layer transition on two blunt bodies at Mach numbers 3.12
Report presenting local heat-transfer parameters on a hemisphere-cone-cylinder and a 120 degree included angle cone-cylinder at a free stream Mach number 3.12 and at a range of Reynolds numbers.
Date:
October 1957
Creator:
Diaconis, N. S.; Wisniewski, Richard J. & Jack, John R.
System:
The UNT Digital Library
Effect of lubricant viscosity on rolling-contact fatigue life
Report presenting a series of rolling-contact fatigue tests conducted in a bench rig at the Lewis laboratory. Four paraffin-base mineral oils of varying viscosity were used as lubricants. A continuous trend toward longer lift was observed with increasing lubricant viscosity over the range studied.
Date:
October 1957
Creator:
Carter, Thomas L.
System:
The UNT Digital Library
Effect of Ground Proximity on the Aerodynamic Characteristics of a Four-Engine Vertical-Take-Off-and-Landing Transport-Airplane Model With Tilting Wing and Propellers
Note presenting an investigation to study the effect of ground proximity on the aerodynamic characteristics of a four-engine vertical-take-off-and-landing transport-airplane model with tilting wing and propellers. Tests were made with the wing at an angle of incidence of 90 degrees, the position used for vertical take-off or landing. Results regarding flow surveys and force tests are provided.
Date:
October 1957
Creator:
Newsom, William A., Jr.
System:
The UNT Digital Library
Theory and apparatus for measurement of emissivity for radiative cooling of hypersonic aircraft with data for Inconel and Inconel X
The importance of radiation as a means of cooling high-supersonic- and hypersonic-speed aircraft is discussed to show the need for measurements of the total hemispherical emissivity of surfaces. The theory underlying the measurement of the total hemispherical emissivity of surfaces is presented, readily duplicable apparatus for performing the measurements is described, and measurements for stably oxidized Inconel and Inconel X are given for the temperature range from 600 F to 2,000 F.
Date:
October 1957
Creator:
O'Sullivan, William J., Jr. & Wade, William R.
System:
The UNT Digital Library
External interference effects of a flow through static-pressure orifices of a NACA airspeed head at a Mach number of 3
Report presenting wind-tunnel testing to determine the static-pressure error resulting from external interference effects of flow through the static-pressure orifices of an NACA airspeed head at Mach number 3 and 0 degrees angle of attack. The results showed that the static-pressure error increased almost linearly with increase in mass flow through the orifices.
Date:
October 1957
Creator:
Silsby, Norman S.
System:
The UNT Digital Library
Rough-Water Impact-Load Investigation of a Chine-Immersed V-Bottom Model Having a Dead-Rise Angle of 10 Degrees
A hydrodynamic rough-water impact-loads investigation of a fixed-trim V-bottom float with a beam-loading coefficient of 5.78 and dead-rise angle of 10 degrees was made at the Langley impact basin. The size of the waves varied from approximately 10 to 60 feet in length and 1 to 2 feet in height. Time histories were obtained showing the position of the model relative to the wave throughout the impact and typical examples are presented. The load coefficient was found to vary primarily with the slope of the impacting wave.
Date:
October 1957
Creator:
Markey, Melvin F. & Carpini, Thomas D.
System:
The UNT Digital Library
Study of Pressure Distributions on Simple Sharp-Nosed Models at Mach Numbers From 16 to 18 in Helium Flow
Note presenting pressure distributions on some simple sharp-nosed aerodynamic shapes at Mach numbers from 16 to 18 in helium flow. The results obtained for the flat plate differ from the prediction of Lees for the strong interaction region by an amount which may be accounted for by the finite thickness of the leading edge. Results regarding the temperature recovery, schileren observations, and pressure distributions are provided.
Date:
October 1957
Creator:
Erickson, Wayne D.
System:
The UNT Digital Library
Weight-Strength Studies of Structures Representative of Fuselage Construction
Note presenting weight-strength plots for circular cylindrical shells in bending. The ring-stiffened shell, the longitudinally stiffened shell, and shells constructed of waffle-like or sandwich-type plates are compared in order to evaluate the effect of type of stiffening on bending strength, and shells of various materials are compared to evaluate the effect of material properties. The effect of shear loads on the bending strength of cylinders is considered.
Date:
October 1957
Creator:
Peterson, James P.
System:
The UNT Digital Library